Here is the full list of all 56 Pankapu achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Beat 20 Zoldates (Claw)
Beat 200 Jawlaths
Beat 20 Deevas
Beat 30 Sh’mups
Beat 15 Sah'laks
Beat 15 Mapihas
Beat 15 Errant Souls
Beat 5 D.O.O.R. Systems
Beat 30 A.I.M. Turrets
Beat Gangreyn
Discover Chii’s origins
Seal the bond between Pankapu and his friends.
Visit all the areas of the Starry Deeps
Get to the top of Itopia
Discover Omnia’s geography
Complete the game
Beat Iketomi
Beat 8 Smoogus
Beat Tokatanka
Visit all the areas of the Archipelago of the Winds
Visit all the areas of Gehöd
Beat 10 Zoldates (Shield)
Beat 15 Kardigans
Leave Peppu
Beat 100 Explosyns
Beat 20 Gelafloras
Defeat the Royal Gelato
Visit all the areas of The Flowery Meadow
Visit all the areas of Crystal Forest
Beat 150 Gelatyns
Beat 20 Gelatos
Find a Mudjin
Discover a Sadhil Seed
Beat 20 Slaps
Defeat Tyroot
Beat 100 Upakis
Visit all the areas of the Arboretum
Visit all the areas of the Verdant Forest
Visit all the areas of Mudjin Mere
Obtain a Nebula
Meet Vaya in Stonefall Henge
Beat 1 Zoldalbino without exploiting their weak point
Beat Zoldabilly
Visit all the areas of Beneath the Roots
Find Stonefall Henge
Obtain a new Aegis
Find a Ferem’s Tear
Beat 30 Logjams
Find all the Forges in Peppu
Find all the Mudjins in Peppu
Beat 20 Magmatos before they explode
Beat 30 Crystalyns
Beat 20 Gelasers
Beat 10 Zoldates (Boot)
Beat 8 Fu’gus
Beat 20 G.U.N. Units